7777421855057 has 8 divisors (see below), whose sum is σ = 8152396818720. Its totient is φ = 7411269831840.

The previous prime is 7777421855033. The next prime is 7777421855059. The reversal of 7777421855057 is 7505581247777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7777421855057 - 2⁸ = 7777421854801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7777421854984 and 7777421855002.

It is not an unprimeable number, because it can be changed into a prime (7777421855059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2205733307 + ... + 2205736832.

It is an arithmetic number, because the mean of its divisors is an integer number (1019049602340).

Almost surely, 2^{7777421855057} is an apocalyptic number.

It is an amenable number.

7777421855057 is a deficient number, since it is larger than the sum of its proper divisors (374974963663).

7777421855057 is a wasteful number, since it uses less digits than its factorization.

7777421855057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4411470223.

The product of its (nonzero) digits is 134456000, while the sum is 65.

The spelling of 7777421855057 in words is "seven trillion, seven hundred seventy-seven billion, four hundred twenty-one million, eight hundred fifty-five thousand, fifty-seven".